need function 'bwlabel' but without image toolbox.Is there any option?

Question

Amy 2015-5-23

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https://ww2.mathworks.cn/matlabcentral/answers/218304-need-function-bwlabel-but-without-image-toolbox-is-there-any-option

编辑： Adam Danz 2020-1-3

I don't have license for image toolbox.Is there any way to do this function? Maybe source code ? I don't know. Thank u for helping :D Wish u a nice day

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Answer 1

Walter Roberson 2015-5-23

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https://ww2.mathworks.cn/matlabcentral/answers/218304-need-function-bwlabel-but-without-image-toolbox-is-there-any-option#answer_180190

在 MATLAB Online 中打开

http://www.mathworks.com/help/images/ref/bwlabel.html

References
[1] Haralick, Robert M., and Linda G. Shapiro, Computer and Robot Vision, Volume I, Addison-Wesley, 1992, pp. 28-48.

So you can look for that book and read the algorithm there and program it.

Or you could purchase a license for the Image Processing Toolbox.

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Answer 2

Adam Danz 2020-1-3

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https://ww2.mathworks.cn/matlabcentral/answers/218304-need-function-bwlabel-but-without-image-toolbox-is-there-any-option#answer_408489

编辑：Adam Danz 2020-1-3

在 MATLAB Online 中打开

I recently had to solve this problem without Image Processing Toolbox but this solution will only work for vector inputs.

% vector of grouped 1s, separated by 0s
v = mod(1:100,10) > 0;
% Solve without Image Processing Toolbox
vcs = cumsum(diff([0,v]) == 1);  % if v is a column vector: [0;v]
L = zeros(size(v)); 
L(v) = vcs(v);
% Solve using Image Processing Toolbox
L2 = bwlabel(v);
% Compare outputs
isequal(L,L2)   % = TRUE, they match